Telemetry Recording System (TRS) Products
Telemetry Recording System (TRS) data files are a record of the state and actions of the adaptive optics (AO) system
NIRC2:
Telemetry Recording System (TRS) data files are a record of the state and actions of adaptive optics (AO) system during NIRC2 science observations when the AO loops are closed (i.e., the AO system is active and providing corrections). Using specialized software (not available through KOA), users can take the TRS information and reconstruct a model PSF for any NIRC2 image, leading to improvements in the precision of NIRC2 astrometry and photometry (see Ragland et al. 2018). Using the TRS files are not required to obtain high quality results from NIRC2 data but are provided to those whose science may benefit from them. TRS data are available in KOA for NIRC2 science data observed beginning on 18 Aug 2019.
The TRS data are stored as IDL .sav files, one for each NIRC2 science file with closed AO loops. These files can be easily read in IDL using the "restore" command or in Python using the "readsav" function in the SciPy package. The parameter names stored in one particular .sav file are as follows:
| Parameter | AO Type | Parameter Type |
|---|---|---|
| A | NGS/LGS | STRUCT |
| CONF_ID | ULONG Array | |
| TIMESTAMP | ULONG64 array | |
| SUBAPINTENSITY | FLOAT Array 2D | |
| OFFSETCENTROID | FLOAT Array 2D | |
| RESIDUALWAVEFRONT | FLOAT Array 2D | |
| DMCOMMAND | FLOAT Array 2D | |
| DMCOMMANDSCLIPPED | ULONG Array 2D | |
| RESIDUALRMS | FLOAT Array 2D | |
| TTCOMMANDS | FLOAT Array 2D | |
| TTSTRAINGAUGE | FLOAT Array 2D | |
| TTCOMMANDSCLIPPED | ULONG Array 2D | |
| APD_IMAT | LGS | FLOAT Array |
| APD_SKY_BACK | LGS | FLOAT Array |
| APD_THRESHOLD | LGS | FLOAT Array |
| B | LGS | STRUCT |
| CONF_ID | ULONG Array | |
| TIMESTAMP | ULONG64 array | |
| APDCOUNTS | FLOAT Array 2D | |
| DTTCENTROIDS | FLOAT Array 2D | |
| DTTCOMMANDS | FLOAT Array 2D | |
| DTTSTRAINGAUGE | FLOAT Array 2D | |
| DTTCOMMANDSCLIPPED | ULONG Array 2D | |
| CENT_G | NGS/LGS | FLOAT Array |
| CENT_ORIGIN | NGS/LGS | FLOAT Array |
| CID | NGS/LGS | ULONG |
| DM_ORIGIN | NGS/LGS | FLOAT Array |
| DM_SERVO | NGS/LGS | FLOAT Array |
| DTT_OFFSET | NGS/LGS | FLOAT Array |
| DT_SERVO | NGS/LGS | FLOAT Array |
| HEADER | NGS/LGS | STRING Array |
| NREC | NGS/LGS | LONG |
| RX | NGS/LGS | FLOAT Array |
| TSTAMP_NUM | NGS/LGS | ULONG64 array |
| TSTAMP_STR_START | NGS/LGS | STRING |
| UID | NGS/LGS | LONG |
Please acknowledge the use of KOA by including this text in your publications:
This research has made use of the Keck Observatory Archive (KOA), which is operated by the W. M. Keck Observatory and the NASA Exoplanet Science Institute (NExScI), under contract with the National Aeronautics and Space Administration.
Please also acknowledge the PI(s) of datasets that have been obtained through KOA, and please contact the KOA Help Desk if you publish archival data.
If your research uses data reduced by the DEIMOS DRP or MOSFIRE DRP, please use the PypeIt Citation.
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The Keck Observatory Archive (KOA) is a collaboration between the NASA Exoplanet Science Institute (NExScI) and the W. M. Keck Observatory (WMKO). NExScI is sponsored by NASA's Exoplanet Exploration Program, and operated by the California Institute of Technology in coordination with the Jet Propulsion Laboratory (JPL).
